There are no infectious agents that can penetrate intact skin.
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Q1: Enteropathogenic E. coli (EPEC) causes gut effacement
Q2: Most of the bacteria involved in periodontal
Q4: Salmonella are _.
A) methane producers
B) motile
C) gram-positive
Q5: The gastrointestinal microbiota has been implicated in
Q6: E. coli O157:H7 secretes shiga exotoxin.
Q7: Defenses of the GI tract against pathogens
Q8: Cells of the immune system are not
Q9: Despite acidic conditions, some microorganisms have been
Q10: Which of the following statements is incorrect
Q11: The gastrointestinal tract has both a long
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